A US woman who shot and killed her husband and two adult children before taking her own life is thought to have committed the shocking crime as a result of being ostracised from the religion she was raised in.

Every time I tell a mate I’m doing a story on cryptocurrency, they invariably ask me the same two questions: should they invest their own hard-earned money, and which cryptocurrency will get them a Lamborghini/yacht/island quickest?

ASIC head welcomes Curtis jail sentence

Those who seek to profit from insider trading must suffer the consequences, ASIC chairman Greg Medcraft has warned following the jailing of white-collar criminal Oliver Curtis.

Curtis, 30, was sentenced in Sydney on Friday to two years' jail, to be released on recognisance after one year, for insider trading that netted him more than $1.4 million.

Mr Medcraft welcomed the sentence and said it reinforced the corporate watchdog's commitment to pursue complex trading cases "no matter how long they take".

"My message to the market as always is that ASIC will continue to take strong enforcement action against those that conduct insider trading to make sure that our markets are fair, orderly and transparent," he told reporters in Sydney on Friday.

"It infects the integrity of our markets and those markets in which the super savings of millions of Australians are invested in."

Curtis, the husband of publicist Roxy Jacenko, was earlier in the month convicted of making illicit trades between May 2007 and June 2008 based on confidential information provided by childhood friend John Hartman, who worked for Orion Assets.

Hartman, whose job it was to execute the trades on behalf of Orion, would send Curtis messages directing him to buy or sell a particular number of Contracts for Difference (CFDs) on a particular company's stock at specific times.

Profits from the scam were spent on a brand new Mini Cooper, a motorbike, holidays in Whistler and Las Vegas and a luxurious Bondi apartment.